equipment dead space the volume of equipment that results in rebreathing of gases.

physiologic dead space the sum of the anatomic and alveolar dead spaces; its volume (VD) is determined by measuring the partial pressure of carbon dioxide in a sample of exhaled gas (PECO2) and in the arterial blood (PaCO2) and (with tidal volume of VT) using the formula VD/VT = (PaCO2−PECO2)/PaCO2.

dead space

1. a cavity, potential or real, remaining after the closure of a wound that is not obliterated by the operative technique;

2.

dead space

Etymology: AS, dead; L, spatium

1 a cavity that remains after the incomplete closure of a surgical or traumatic wound, leaving an area in which blood can collect and delay healing.

2 the amount of lung in contact with ventilating gases but not in contact with pulmonary blood flow. Alveolar dead space is characterized by alveoli that are ventilated by the pulmonary circulation but are not perfused. The condition may exist when pulmonary circulation is obstructed, as by a thromboembolus. Anatomical dead space is an area in the trachea, bronchi, and air passages containing air that does not reach the alveoli during respiration. As a general rule, the volume of air in the anatomical dead space in milliliters is approximately equal to the weight in pounds of the individual affected. Certain lung disorders, such as emphysema, increase the amount of anatomical dead space. Physiological dead space is an area in the respiratory system that includes the anatomical dead space together with the space in the alveoli occupied by air that does not contribute to the oxygen-carbon dioxide exchange.

Physiology All non-air exchanging spaces of the upper respiratory tract; there are ± 2.0 ml of ‘dead space’/kg body weight—i.e., a 70-kg person has 140–150 ml of dead space in the oronasopharynx, bronchi, and bronchiolesTherapeutics That part of a syringe’s tip and needle that contains medication that cannot be administered; dead space is very important in insulin therapy, and for drugs in which the syringe has < 0.5 mL capacity

dead space

Clinical therapeutics That part of a syringe's tip and needle that contains medication that can't be administered; DS is very important in insulin therapy, and for medications where the syringe has < 0.5 mL capacity

dead space

dead space

the air in trachea, bronchi and bronchioles that does not take part in gaseous exchange. Of each breath of 500 cm3, only about half of the air reaches the alveoli.

dead space

in human anatomy and physiology, refers to the respiratory passages (airways) leading to the alveoli of the lungs, so named because the air breathed in and out of this space does not reach the alveoli and so takes no part in gas exchange with the blood; dead space ventilation the volume of gas breathed in and out of the dead space per minute, normally about one-third of the total ventilation (minute volume) at rest, becoming a smaller fraction as tidal volume increases in exercise.

dead space

(ded spās)

A cavity, potential or real, remaining after the closure of a wound that is not obliterated by the operative technique.

All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.